Posted by Anonymous on .
Volunteers who had developed a cold within the previous 24 hours were randomized to take either zinc or placebo lozenges every 2 to 3 hours until their cold symptoms were gone. Twentyfive participants took zinc lozenges, and 23 participants took placebo lozenges. The mean overall duration of symptoms for the zinc lozenge group was x1 = 4.4 days, and the standard deviation of overall duration of symptoms was 1.6 days. For the placebo group, the mean overall duration of symptoms was x2 = 8.1 days, and the standard deviation was 1.5 days. Compute a 95% confidence interval for the difference in mean days of overall symptoms for the placebo and zinc lozenge treatments. Use the unpooled standard error and use the smaller of n1  1 and n2  1 as a conservative estimate of degrees of freedom. (Round the answers to one decimal place.)
3 to 4 days

math 
tom,
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